Dissolution of UO2, UO3 and of some lanthanide oxides in BumimTf2N: effect of acid and water and formation of UO2(NO3)3−
Dissolution of UO2, UO3 and of some lanthanide oxides in BumimTf2N: effect of acid and water and formation of UO2(NO3)3−
Billard, I.; Gaillard, C.; Hennig, C.
Abstract
UO2, UO3, Nd2O3, Eu2O3 and Pr6O11 powders were successfully dissolved in the ionic liquid
1-methyl-3-butyl-imidazolium bistriflimide (BumimTf2N) with the help of small amounts of HNO3.
The uranyl species have been characterised through UV-vis and EXAFS spectroscopies. The uranium
dissolution leads to the formation of UO2(NO3)3−, even in the presence of water. The kinetics of UO2
dissolution/oxidation is intricate, due to the transient existence of NO2−, which is absent in the case of
the UO3 dissolution, occurring with no change in the oxidation state of U.
Keywords: EXAFS; UV-Vis; UO2; UO3; ionic liquids
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Dalton Transactions 4214(2007), 4214-4221
DOI: 10.1039/b706355e
Cited 60 times in Scopus
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